rocket science

1. military

1.1. Marines

1.1.1. logistics

1.1.2. Rifleman

1.1.3. Engineer Equipment Mechanic

1.1.4. Combat Engineer

1.1.5. Logistics Vehicle System Operator

1.1.6. Cryogenics Equipment Operator

1.2. Navy

1.2.1. logistics

2. rocket mechanic

2.1. nasa

2.2. car mechanic

2.3. military mechanic

3. code designing

3.1. coding for the computer at nasa